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Method for purification of hydrocyanic acid

A purification method, the technology of hydrocyanic acid, applied in the direction of cyanic acid/isocyanic acid, etc., can solve the problems of rectification tower clogging, lower operating degree, packing agglomeration, etc., to increase energy consumption, reduce energy consumption, and evenly distribute Effect

Active Publication Date: 2017-02-01
CHONGQING UNISPLENDOUR CHEM
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Obviously, this is only a countermeasure to reduce the degree of operation, but it does not fundamentally solve the hazards such as blockage or packing agglomeration of the rectification tower due to polymerization during the rectification of prussic acid, which affects normal production operations and caused safety hazards

Method used

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  • Method for purification of hydrocyanic acid
  • Method for purification of hydrocyanic acid

Examples

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Embodiment 1

[0039] A method for purifying hydrocyanic acid, wherein, the structure of the production device used in the method for purifying is as attached to the description figure 1 As shown, the absorption tower 1 is provided with a spray liquid inlet pipeline, a hydrocyanic acid synthesis gas inlet pipeline and a tail gas pipeline; Along the direction from the stripping tower 2 to the absorption tower 1, a cold-heat heat exchanger 4 and a chilled water heat exchanger 5 are sequentially provided; the connection between the top of the stripping tower 2 and the bottom of the absorption tower 1 On the pipeline, a cold and hot heat exchanger 4 is connected; the reboiler 6 communicates with the stripping tower 2 through a circulation pipeline; the tower top of the stripping tower 2 communicates with the tower still of the rectifying tower 3; It is also communicated with circulation pump 7; circulation pump 7 is also communicated with outer circulation cooler 8; outer circulation cooler 8 is...

Embodiment 2-6

[0044] The structure and each equipment of the production device adopted in the embodiment 2-6 are all the same as the embodiment 1, and its preparation steps are also the same as the embodiment 1, the difference is only that different processing parameters are set in the embodiment 2-6, Carry out the rectifying purification process of hydrocyanic acid; Operating parameter and each detection data of setting among the embodiment 2-6 are shown in the following table 1:

[0045] Operating parameters and each detection data set in the embodiment 2-6 of table 1

[0046]

[0047] In addition, the present invention has also carried out the following operations as a comparative example, the structure of the production device adopted and each equipment are the same as in Example 1, and the various process parameters set in the preparation steps are also the same as in Example 1, The only difference is that in this comparative example, the circulation pump 7 and the external circulat...

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Abstract

The invention relates to a method for the purification of hydrocyanic acid. The method for the purification of hydrocyanic acid comprises an absorption step, a stripping step and a distillation step, and is characterized in that hydrocyanic acid-containing absorption liquid obtained in the absorption step enters the top of a stripping tower from a tower kettle of an absorption tower through pipelines; distillation tower kettle liquid in the distillation step is withdrawn through a circulating pump, part of the distillation tower kettle liquid is returned to the lower segment of a distillation tower, and the other part of the distillation tower kettle liquid is sent to the top of the stripping tower. The method for the purification of hydrocyanic acid can achieve the control of the liquid level in the distillation tower and ensure that polymerization phenomena does not occur in the distillation process of the hydrocyanic acid.

Description

technical field [0001] The invention relates to the separation and purification of chemical intermediates, in particular to a method for purifying hydrocyanic acid. Background technique [0002] As an important chemical intermediate, hydrocyanic acid can be used to manufacture important chemical products such as glyphosate, methionine, acrylic resin and nylon 66, especially the production of acrylic resin and nylon 66 requires a large amount of high-purity liquid hydrocyanic acid. [0003] Hydrocyanic acid has special physical properties. It is a colorless, transparent, volatile liquid with a bitter almond smell and is a highly toxic chemical. Miscible with water, soluble in ethanol, ether, glycerin, benzene, etc. Hydrocyanic acid has self-polymerization characteristics, especially in the rectification process of producing liquid hydrocyanic acid, polymerization problems often occur, which will cause agglomeration of rectification tower packing or The blockage of the tray w...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01C3/14
CPCC01C3/14
Inventor 郑伯川柳亚玲范倩玉郑道敏丁永良王冬林
Owner CHONGQING UNISPLENDOUR CHEM
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